Apparatus for the grading of abrasives for use in continuous glass grinding machines



06L 6, 1931. F; a.- WALDRON ETAL ,585

, APPARATUS FOR THE GRADING OF ABRA'SIYES FOR USE IN CONTINUOUS GLASS GRINDING MACHINES Filed June 19, 1930 (N w: R

' fizz/210501 C7 did; I

' 4 abrasive in granular or Patented Oct; 1,931"

v r nnnnn c iaannns-fwAnnnoim, or rnnsoor, AND JAMES HARRIS enirriiv, or s1.

7 nann es, ENGLAND, assrenonsmo rinxmsroiv nno'rnnns LIMITED, or LIVEB- rooL, ENGLAND I, AIQPVAZRATUS roR'TiiE GRADI G or ABRA'sivEs non, nsn

' Y eninn ne MACHINES 1 abrasives for use in continuous glass grinding machines and has for its particular ob ects to provide-an improved continuously func- L 5 tioning horizontalfi'owgrading apparatus,

, those particular grades of abrasives.

v Grading apparatus accor'dingto the invention comprises achannelincreasing in crosssectional area. from the inlet to' the overflow and has subinergedpartitions for-min tanks 1/ 5 in which the diflerent grades; of a rasive settleand-zfrom whichxthey are continuously discharged to respective parts of the grindingf' apparatus," those portions/of the channel in which the velocityis high'beingformed in a; tank of greater cross-sectional area. I i V Theapparatusfurther comprises the provision of aplurality of hoppers in which each tank' terminates, the hoppers leading to discharge orifices from all of-which approximatelyrthe same: grade of abrasiveis dis- 7 charged. downwards, and :the walls ofthe hoppers are inclined at an angle to the verti cal which is less than theangle of repose' of' the abrasive in wateriiso asto ensure'the fall of thematerial to. the discharge orifices atthe bottomofthe'hoppers. Y

F 'For 'conveniencevof'descriptionfthe abrasive dealt with is hereinafter regardedas sand, but it will be obvious that any other powdered form may be'treated by the invention. 1

The invention will 11Q dsfiribed {reference to the accompanying drawings whichdiagrammatically represent one "constructional arrangementofi apparatus' em- -bodying the improvementsi' In these draw.-

Figure I is a side' elevation' of said 'con structional; arrangement wi the end por tionbrokenaw'ay; 7;.

Figure? :is a plan: QfIsaid arrangement; a

isure -3 a QIT 1QCfi Q hro gh v-A ofFigurje-Qonan enlarged sc'ale, and

. 750 g, fFigure Lisa longitudinal section of a por This-invention relates to the grading "of- IN oon'rinnous GLASS "Applicationfiled J'une' 19, 193 0, seriaino.4s'2,174, nd in jG reat' nritainasl 12, 1929.

apparatus, also on an enlarged catelikeor:corresponding'parts.

be; regardedionly as a convenient example, the channel has; four sections,the first section being formed by'walls 1,thesecond by walls 2, the third by walls 3 and the fourth by walls t. I11 the first sectionthe walls 1 diverge from the inlet 5 to the full width ofthe channel'i'n the second section. In the second, third and, fourth sections thewalls are paral= lel, but the width of thechaniielbetween them is ,greaterin: eachsection than in the preceding; T q ,In' thesecond, third and fourth sections, submergedpartitions 6 divide up the channel into tanks, in WhlChutllQ' different gradesof abrasive settle.- In the second section, each tank terminates downwards in four ho pers 7 ,ea'chhavinga discharge orifice 8. n the third andgfourthsections each tank terminate'sjin-six hoppers 9' and eight hoppers 10 respectively, each hopper having a discharge 0.1ifiQe8Q E 'In'the first sectionthe velocity-of fiow of the mixture-of abrasive and water, which is fed into theinleto, isso high that the tur-v bulence caused by the flow preventsfdu'e settlement ofqthe abrasive-between the partitions), 1 The channehtherefore, with its walls 1, is formed in a tank having walls 11,=the width betweenithem being the same as that between the walls 2 ofthe channel in the second section'.-;: i 'The' 'channel is provided with submerged partitions 12,1a'nd between the walls 1 and the walls 11 are partitions 13 reaching above the water levelqliFigure 3). By this Walls-1 and above; the partitions 12, while ,tlier'eis a comparatively stationary'body of Water? and abrasive in the spaces in the tanks between the walls 1 and 11 and betweenthe partitions 13.1 ;lhis body of water and the water in; the hopper below is protected from the turbulence ofthewaterbetween the par;

, u; Inithe arrangement illustrated, wh chis to titions 12" 2 L I 1ilthe abrasive in it is able to" v clischar tBf w ili e' h, .o and third: and the 'third -ia-nd fourth sections 7 settle more quickly.

:formed'bythefwalls 1 l and the purtitions 12 a d. 13; terminatesiinfour hoppers [with second section;

are partitions 15, formin g weirs and the urth ec i9n.;..te .mi1.1ets in-re. weirrliigqve t x lmmediately 1 1-e thei 'weirs F15 t oug ;,wi th di gh e r Rh e-r 11 rT ee upper edgesot the troughs are 'at such levels ib'o veithe-weirs 15f1:(eee particularly Eigurfe A passage is then formed through Which-*Wateri flours; directly tothe discharge Q r Accoi'dingjto' the;1nveritioh these: i j .1 tiesi-are surmounted intwo yvays. First..-. the

wallspfthe hopper's areinclineda-at an angle 20416 thewerticalzwhich; is'flesslthaui the angle I of rjepose ofthefabmivein ater.' .Sec o 1d ly, each tankhas at least fou r hoppersg from grad of. abrasi fveiis discharged; Iid all these orifices olischarge' iuto "a common pipelead-I,

ing to the rgrindiugrunner or runners using ,,thegracleiot 'abrasiver By reason of i the'iinc Wi'aZll's,"the discharge ofabrasive is more regu; zlarfehd the dangerof the" discharge I orifices becoming bl'oc'lied 'is miniinizecl. By reason of thepluralityof hoppers from which the grade of abrasive; is discharged, the Supplyfofgebr' asive is not iinterruptedi the j event "bfone oftheidischarge orificesbecom bed" our inveriti'on welde [supplying 'it coritinuously; the". coihbinetion' 'ppa t' sgrorjagfnadii gpb t ive a nd of a 'chzil nnel along; which the'l u ixt ure be crose seotionall' hrea frorhj the lnlet'to th over; V ubinferged pstrtitionsg the-channel forming: tarik'g in which the difierent grade's ofa' brasive Settle er ld from 'whi'ch saicl-grades "cohti riuously;discharged; J and tanksj fof ge. orifices '8 similar to th9. iILihQ. v V r t nkeptereat v@osee fi ml he then th V enamel-651mm ng -overa length thereotat follo ed;- the; fall of; nr'l'tss' of:abrasivewhich frequently blocks up section ztl area, frorn the inlet to the overflow submerged partitions inthe'channel forming "Each of the tanks {-in, the first section;

tanks, a plurality of hoppers constituting the dOWHWEyEd termihatio :"ofieach' tank; leading.

tof dicharge orifices from all oi? which the game grade of abrztsivegis.tl1scherged5 and 3., 1,11 mpe hi br iveai 1' it c ohtinuou's lfi' the combination oofiacha'finel. along which the mixture to be radual? ows; said from theihlet to the overflow, 1 submergedpartitions 1111-: the; chann l iormi.nggtihksi pluralit f hoppers cont-l jstituting the ,blownwa dzt mmation"0iE each ankglegiding to diiscliz rge orificesfrom all of which the; genie; girade'ioi;abrasive is: 5 dist-L ChalIgd5i Q fil1gil 0.1; fSlQ-PBF-COM the "vertical-1' ofitlte. hopper rvwa ls eing 1 sshauthe ang e oflrepose ot-theqabraslive i iujW-eter; audgtanks oigreeter cross-sectional are'e thanthe c an: n e tendingmt r. a ngthrthereotaat; the inlet; end, which tanksvthe channel s formed-J 7 4.; In;,upparatusforigrediiig;ebmsivelend supply ngit -,'cjont inuou sly,: that-combination of Ia;;ch; nn'el.'al orig, whi.clithe mixture to be.

gredeclj 'flowsig; said; channel; increasing. in orosssectlo' lfereairOmt-heinlet tQtheaOVeT-t flew, T diverging ing parallel walls'betweeii'zwhich;saidrdiuerge thgcli've rgingl wille -end :Jp ara'llelrv'vellemlex.

w 311 forming.aypoiition of sa d channelettheinlet ehd, a:container halve tendinggabove the water level, s aidpartitions forfm-ihgi. tanks ;in .which idifierentrgrades zof V abrasivers'ettle. and;from,which, sa-idrgredes arercontinuousliy discharged.

. .I-rpapparutus" for grading abrasive; and supplylngi itv continuously, the combination 7 ofje -che uii1el' elougo' which lthe mixture-t0 be 7 graded vflows, diverging forming the inlet section i of :s'ai'cli chehnelg parallel walls forminggfu-rther; sections of saidgchannelathe w1clth-,ot eachperellel-wallech section being greateruthen that :of thegp'r e'ceiing paralleh Walled se n; v a .QQIJJQQL H QIZha iilgepfil'flllel Wa sr etwee ew ichs idp vergiilg lls a rlqeetedw u mer ed;irer tifim i, W thin-the er hel ivl t r- V 120 .materlet ,said pert tidn forming' tanks m whieh difleren't grades er r me i h' k de ed 7' h -meekwe' erti i nebe; 1 g, WfllSflQd iihg e id i te ev e1 10 sa ico ain x aerial.

rried-1i inletv sectiouiogt said;hemielypereillel Walls V i in T j width ef'eaeh parallel-walled saion bein I Walled section, a container having parallel Walls between which said diverging walls are greater than that, Of the preceding parallellocated, submerged partitions within the channel, partitions between the diverging Walls and the Walls of said container extending above thewater level, said partitions forming tanks, and a plurality of hoppers constituting the downward termination of each such tank leading'to discharge orifices from all of which the same grade of abrasive is discharged, the angle of slope to the verti-' cal of the hopper Walls being less than the 5 angle of repose ofv the abrasive inrwater.

In Witness" whereof we have 'aflixed our I signatures hereto.

FREDERIC' BARNES WALDRON. v JAMES HARRIS GRIFFIN. 

